Merge PR #28865 into master

* refs/pull/28865/head:
	mon/OSDMonitor: fix _lookup_snap to verify the pool matches
	ceph_test_rados_api_*: make failing to clean up namespace non-fatal
	osd: store purged_snaps history under separate object

Reviewed-by: Samuel Just <sjust@redhat.com>

diff --cc src/osd/OSD.cc
Simple merge

diff --cc src/osd/OSD.h
Simple merge